Microsoft CEO and Chairman Satya Nadella on Tuesday issued a rare warning about the future of artificial intelligence, saying that if it stays limited to big tech companies and wealthy economies, and does not spread to other areas, the ongoing AI boom may turn into a bubble. Speaking at a session during the World Economic Forum Annual Meeting in Davos, Switzerland, Nadella said that the long-term success of AI would depend on the fast-advancing technology being used by a broad range of industries as well as through an adoption by countries outside the developed world. “For this not to be a bubble by definition, it requires that the benefits of this are much more evenly spread,” Nadella said, speaking at the forum.